Radio transmission system providing adjacent channel and image f

Details Radio transmission system providing adjacent channel and image f Radio transmission system providing adjacent channel and image f

1986-06-30

1989-09-05

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455304, 455306, H04B 110

Patent

active

048646431

ABSTRACT:
A radio transmission system a base station comprises a plurality of transmitters arranged to transmit from the same site and having substantially the same output power, each transmitting on an individual channel within a dedicated block of contiguous channels. Receivers tuned to channels within said block of channels therefore require a limited image and adjacent channel rejection, of the order of 30 db. The receiver is preferably a direct conversion phasing receiver which has a local oscillator which can be tuned to a frequency within the block such that an image of any channel also falls within the block of channels. The system is suitable for local area radio systems such as paging or cordless telephones.

REFERENCES:
patent: 2572235 (1951-10-01), Young, Jr.
patent: 2640193 (1953-05-01), Carter et al.
patent: 2895009 (1959-07-01), Busignies
patent: 3624513 (1971-11-01), Costas
patent: 3961172 (1976-01-01), Hutcheon
patent: 4408351 (1983-10-01), Maurer et al.
patent: 4584715 (1986-04-01), Baars et al.
patent: 4696055 (1987-09-01), Marshall
patent: 4731875 (1988-03-01), Mizukami et al.

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